About 30,000 teachers were expected at the state capitol in Oklahoma City, where they formed long picket lines.

There is now a continuous line of teachers circumnavigating the Oklahoma State Capitol, protesting state funding level for public schools. #oklaedwalkout #oklahomateacherwalkout https://t.co/w28J4KgOkS

Here's a look at the main crowd.

Here’s the size of the crowd outside the capitol in Oklahoma City right now. Public school teachers are striking with the support of parents, students and superintendents, just like in WV and KY. The mood is electric. https://t.co/4NPCZcCnXG

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Jordan Carter, 13, Kennedy Fridia, 11, and Skyler Carter, 9, said they came to the capitol to support their teachers. The students said overcrowding is a problem, with as many as 30 kids per class, and there are often not enough desks for everyone to sit.

Other students told BuzzFeed News about classroom conditions that brought them out to protest — this art student said his class hasn't had blue paint for months.

An art student in Oklahoma: “We ran out of blue paint two months ago...there’s no paper, there aren’t pencils, we’re out of glue...last year I had four classes where I didn’t have a chair” https://t.co/Ry5F3JCJQH

Oklahoma teachers and students have been posting images of their outdated textbooks to help illustrate why people are protesting.

I'm taking AP European History and this is what info our textbooks contain. Someone wrote in the most recent presidents. They have Tony Blair as the most recent PM. How am I supposed to get a 5 on the AP test with outdated info?
#oklaed #oklahomateacherwalkout
#oklaedwalkout https://t.co/e016Xv7hu6

In addition to improved teacher pay, protesters showed up to demand raises for public school support staff, like janitors, cafeteria workers, and aides.

One of the top reasons teachers in Oklahoma are walking out, despite a $6,000 raise legislators passed, is that classroom support staff won’t see their pay increase and per pupil classroom funding remains rock-bottom. https://t.co/aptior8LLX

Jason Lightel, 38, a high school English teacher from McAlester, Oklahoma, said he decided to strike when he learned the bill the Oklahoma legislature passed last week did not include increased funding for support staff. "It was the equivalent of a pizza night a month for them," he said of the allocated money.

Some teachers, like Jason Lightel, 38, of McAlester, OK, have been here since 5:30 am. Lightel teaches high school English. “McAlester was made famous in Steinbeck’s Grapes of Wrath. I grade essays that look like this. The Joads go to CA. Our teachers go to TX.” https://t.co/04ppJOSnTE

"It's not just about us," a kindergarten teacher told BuzzFeed News.

A kindergarten teacher in Oklahoma told @BuzzFeedNews that schools need funding for support staff: "Without [my teacher's aid], I would be spending more time with my special needs children than teaching the whole class." https://t.co/YOxLB5cKei

Some educators had gone on strike decades prior.

Hope Davis, a sophomore at Oklahoma public high school, spoke to the crowd during the rally. "Many refer to it as a historic bill," she said of the raise passed by legislators. "Many fail to realize that funding education should not be historical. It should be normal." Signs throughout the day said the same.

Also at the main rally, National Education Association president Lily Eskelsen García‎ addressed the crowd and called on legislators to make real change for teachers and students.

"For a dozen years, we sent emails and letters and phone calls and visits. For years, we’ve explained what was happening as they ignored the needs of public schools. And they ignored us. And now we are taking to the streets." #OKWalk4Kids #oklaed https://t.co/cf4sYbaJV2

"You have given them your blood, sweat and tears – your early mornings and your late evenings because you believe in this thing called public education that makes the world a better place for someone else’s child," García‎ told teachers.

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Schools are preparing for classes to be closed for the entire week, as teachers say they'll be on strike until the state legislature provides more education funding.

Teachers in Kentucky also protested in their state capitol on Monday, demanding higher wages and calling on Governor Matt Bevin to veto a controversial bill passed last week that overhauls teacher pension plans.

In Oklahoma, the walkout is technically a “wildcat” action, which means the strike was not authorized by union leaders. Oklahoma’s frontline workers instead organized for weeks online and in person, relying on a Facebook group of tens of thousands called “Oklahoma Teachers United.”

Thanks to years of austerity budgeting, Oklahoma teachers haven’t had an across-the-board raise in 10 years, while funding per pupil has been slashed by 28% since 2008.

One of the reasons it’s not over yet...This is a textbook from my daughter’s class. It’s a history book and the current President in it is George W. Bush. We can do better Oklahoma.
#OklahomaTeacherWalkout
#oklaed #oklaleg @gophouseok @oksenategop @housedemsok @oksenatedems https://t.co/F5FE3JcFQh

Galvanized by the success of teachers in West Virginia, who won a 5% increase from lawmakers after a nine-day walkout, the Oklahoma teachers are asking for a $10,000 raise over the next three years, as well as increased investment in classroom budgets.

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Many districts have been forced to go from five-day weeks to four in Oklahoma, to deal with the crisis of resources. Textbooks are hard to come by or out of date, and arts and music classes have been eliminated, while class sizes have swelled.

Pay in Oklahoma is currently the lowest in the nation, with teachers’ salaries beginning at just $31,600 for a teacher with a bachelor’s degree, a floor set by the state legislature.